Citation: Gunter, M. E.; Dyar, M. D.; Twamley, B.; Foit, F. F.; Cornelius, S. (2003). Composition, Fe3+/Sum(Fe), and crystal structure of non-asbestiform and asbestiform amphiboles from Libby, Montana, U.S.A.. American Mineralogist, 88, pp. 1970-1978.